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CVE-2026-29183— SiYuan: Unauthenticated reflected SVG XSS in `/api/icon/getDynamicIcon` (`type=8`) enables arbitrary JavaScript execution

Quick assessment

Affected
siyuan-note siyuan
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.5.9之前版本存在跨站脚本漏洞，该漏洞源于动态图标API端点未对攻击者控制的内容进行转义，可能导致反射型跨站脚本攻击，进而执行经过身份验证的API操作并泄露敏感数据。

CVSS 9.3 · Critical EPSS 0.62% · P47

Public Exploits 1

Nuclei · 1 CVE-2026-29183.yaml [template]

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-29183

Vulnerability Information
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Vulnerability Title
SiYuan: Unauthenticated reflected SVG XSS in `/api/icon/getDynamicIcon` (`type=8`) enables arbitrary JavaScript execution
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is a personal knowledge management system. Prior to version 3.5.9, an unauthenticated reflected XSS vulnerability exists in the dynamic icon API endpoint "GET /api/icon/getDynamicIcon" when type=8, attacker-controlled content is embedded into SVG output without escaping. Because the endpoint is unauthenticated and returns image/svg+xml, a crafted URL can inject executable SVG/HTML event handlers (for example onerror) and run JavaScript in the SiYuan web origin. This can be chained to perform authenticated API actions and exfiltrate sensitive data when a logged-in user opens the malicious link. This issue has been patched in version 3.5.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.5.9之前版本存在跨站脚本漏洞，该漏洞源于动态图标API端点未对攻击者控制的内容进行转义，可能导致反射型跨站脚本攻击，进而执行经过身份验证的API操作并泄露敏感数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan < 3.5.9 -

II. Public POCs for CVE-2026-29183

# POC Description Source Link Shenlong Link
1 Unauthenticated reflected cross-site scripting (XSS) vulnerability in all versions of SiYuan Note containing `/api/icon/getDynamicIcon` with unsafe `type=8` rendering logic. Attacker-controlled `content` is inserted directly into SVG output without proper sanitization. An attacker can execute arbitrary JavaScript in users' browsers when they visit a crafted malicious link. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-29183.yaml POC Details
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III. Intelligence Information for CVE-2026-29183

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Vendor Advisories for CVE-2026-29183 (1)

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-29183

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